. >> reporter: with the windmill down over the new england patriots, john harbaugh became the second part in a writer's dream. that's because hours earlier, his brother coached the 49ers to the super bowl. the harbaugh, you get the idea. >> they down played their story. >> not like churchill and roosevelt or anything. >> the fighters are first, playing,thy players have the most to do with it, the ones wee should be talking about. >> we're not that interesting, nothing more to learn. >> reporter: sports fans are always interesting when it's siblings fighting for the biggest prize like williams sisters in tennis and manning boys in the nfl. like them, the harbaugh brothers had family that supported them on the way to the top. >> this is the first time in american sports it's siblings head coaches squaring off, not generals or players but head coaches who love each other and hate to lose. >> reporter: their father jack was a lifer himself and wanted them to be the best. >> they wanted to be the best and the thing they had the tremendous capacity for, when they got knocked down, they had